I've followed the instructions in IRS Publication 936 (https://www.irs.gov/pub/irs-pdf/p936.pdf) and calculated the reduced amount of interest that should be deductible.
For the purposes of this example, let's say this value is $27,000.
However, when I enter this value in TurboTax in the mortgage deductions, it doesn't match what is visible in my Form 1040 Schedule A, 8a. (visible in preview before filing). The amount that shows up in the 1040 Schedule A is much less than the amount I calculated and entered in the deduction section. For this example, let's say the value is $15,000.
So, how do I correctly get the deduction applied?